Re-exported predicates

Wrap must/1 over parts of your code you do not trust
If your code fails.. it will rewind to your entry block (at the scope of this declaration) and invoke rtrace/1 .
If there are 50 steps to your code, it will save you from pushing creep 50 times.
Instead it turns off the leash to allow you to trace with your eyeballs instead of your fingers.

Format a message if debug topic is enabled. Similar to format/3
to user_error, but only prints if Topic is activated through
debug/1. Args is a meta-argument to deal with goal for the
@-command. Output is first handed to the hook
prolog:debug_print_hook/3. If this fails, Format+Args is
translated to text using the message-translation (see
print_message/2) for the term debug(Format, Args) and then
printed to every matching destination (controlled by debug/1)
using print_message_lines/3.